With the eggs hatch them in the late morning server time so you don't have to deal with low temps at night. Get the milk after they have hatched as you have around hal hour till they need food. First milk force feed at around 400 food. After they reach Juvinile the feeds can be every 3-4 hours but you need a fresh batch as the preserving bins wont keep the milk. Keep 1 so you can do any imprinting. Before you undertake this do build a stone wyvern capture for easy knockouts. Lvl up to 10 poison are the easiest to trap.
I got a level 150 lightning egg and I was so excited to hatch the egg...that when I went to put the egg down I accidentally ate it instead. :( ps4 users: R2 ISN'T GONNA DROP THE EGG YOU'RE GONNA EAT IT LIKE ANY OTHER EGG. REMEMBER THIS. LOGIC BEFORE EXCITMENT.